Nothofagus leoniEspinosa, a natural hybrid betweenNothofagus obliqua(Mirb.) Oerst. andNothofagus glauca(Phil.) Krasse

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Abstract
Nothofagus glauca and N. obliqua are deciduous species whose habitats overlap in some moist sites in the coastal mountains of Chile between the Maule and the Itata Rivers and in the Andes around 1000-1100 m between the Maule and the Nuble Rivers as well as in some areas in the lowlands. N. leoni is found as scattered trees where the distributions of these two species overlap. This condition and some earlier references give a basis for hypothesising that N. leoni is a hybrid between N. glauca and N. obliqua. Hybrid index, chromatographic analysis, pictorialised scatter diagrams, and morphological, anatomical, and ecological analyses were carried out to obtain evidence to support the hybrid hypothesis. The evidence indicates that N. leoni is a hybrid between N. glauca and N. obliqua and, furthermore, suggests that introgressive hybridisation occurs and that the great variability of N. obliqua in areas where the hybrid occurs is due to infiltration of N. glauca genes into N. obliqua populations through the N. leoni hybrid.

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